Are You A Biology Student? Take This Quiz As A Mock Test

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1/50 Questions
1. What makes a cell prokaryotic?
- A. When it have a nucleus enclosed within a nuclear membrane
- B. When its DNA is bound together by proteins in chromosomes
- When it lacks a nucleus or any other membrane bound organelle
- D. When it exists in form of a colony.

About This Quiz

Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field.
Are You a Biology Student? Take This Quiz As a Mock Test. Are You a Biology Student? Take This Quiz As a Mock Test

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2.
1. Biome with well developed grass cover interspersed with scattered shrubs and small trees is called ?
- A. Tropical deciduous forest
- B. Grassland
- C. Temperate forest
- D. Savanna
Correct Answer

A. D. Savanna

Explanation

A savanna is a biome characterized by a well-developed grass cover interspersed with scattered shrubs and small trees. This biome is typically found in tropical or subtropical regions with a pronounced dry season. The grasses in the savanna are adapted to fire and grazing, and the scattered trees and shrubs provide some shade and shelter. This type of biome is home to a diverse range of wildlife, including large herbivores like elephants and giraffes, as well as predators like lions and cheetahs.

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3.

Rhizobium which lives in the root nodules of a leguminous plant is an example of the association known as ?
- A. Commensalism
- B. Mutualism
- C. Saprophytism
- D. Epiphytism
Correct Answer

A. B. Mutualism

Explanation

Rhizobium living in the root nodules of a leguminous plant is an example of mutualism. Mutualism is a type of symbiotic relationship where both organisms involved benefit from each other. In this case, Rhizobium provides nitrogen fixation to the plant, which helps the plant in obtaining essential nutrients. In return, the plant provides Rhizobium with a suitable environment and nutrients. Both organisms rely on each other for survival and benefit from this association.

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4.

Which of the following microbes causes cholera.
- A. Virus
- B. Bacterium
- C. Protozoan
- D. Plasmodium
Correct Answer

A. B. Bacterium

Explanation

Cholera is caused by a bacterium, specifically Vibrio cholerae. This bacterium is transmitted through contaminated water and food, and it releases a toxin in the intestines that causes severe diarrhea and dehydration. Viruses, protozoans, and plasmodium do not cause cholera.

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5.

Adaptation to avoid overcrowding include all the following except? C. Territorial behavior
- A. Immigration
- B. Dispersal of fruits and seeds
- C. Territorial behavior
- C. Territorial behavior
Correct Answer

A. A. Immigration

Explanation

Adaptation to avoid overcrowding includes various strategies such as dispersal of fruits and seeds and territorial behavior. Immigration, on the other hand, refers to the movement of individuals into a population from another area. This does not directly contribute to avoiding overcrowding, as it involves the addition of individuals to an already existing population. Therefore, immigration is not an adaptation to avoid overcrowding.

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6.

The functional roles of an organism is referred to as.
- A. Responsibility
- B. Interaction
- C. Niche
- D. Symbiosis
Correct Answer

A. C. Niche

Explanation

The functional roles of an organism refer to the specific position or role it occupies within its ecosystem. This includes its interactions with other organisms, its habitat preferences, and its role in nutrient cycling and energy flow. This concept is known as the organism's niche. The niche of an organism determines its place in the ecosystem and how it contributes to the overall functioning of the ecosystem.

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1
7.

Which of these is an adaptive feature in a marine habitat?
- A. Bladder for floating
- B. Hold fast for attachment
- C. Strong protective and impermeable covering against high salinity
- D. Fur to prevent loss of water
- E. Retention of urea in the blood for osmoregulation
- Option 6
Correct Answer

A. B. Hold fast for attachment

Explanation

Hold fast for attachment is an adaptive feature in a marine habitat because it allows organisms to anchor themselves to the substrate and withstand the strong currents and waves in the marine environment. This adaptation helps them to avoid being swept away and provides stability and support for feeding, reproduction, and other activities.

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8.

Sexuality transmitted infections can as well be referred to as ?
- A. COVID 19
- B. Staphylococcus
- C. AIDs
- D. STDs.
Correct Answer

A. D. STDs.

Explanation

Sexually transmitted infections (STIs) are infections that are primarily spread through sexual activity. They can be caused by bacteria, viruses, or parasites. COVID-19 is a respiratory illness caused by the SARS-CoV-2 virus and is not classified as an STI. Staphylococcus is a type of bacteria that can cause various infections but is not specifically associated with STIs. AIDS (Acquired Immunodeficiency Syndrome) is a condition caused by the HIV virus, which can be transmitted sexually, among other ways. However, AIDS is a specific stage of HIV infection and not a general term for STIs. Therefore, the correct answer is D. STDs, which stands for sexually transmitted diseases.

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9.
1. The better way to avoid contacting STIs is ?
- A. Get pregnant
- B. Avoid breastfeeding
- C. Family planning
- D. Use condom.
Correct Answer

A. D. Use condom.

Explanation

Using a condom is the better way to avoid contacting sexually transmitted infections (STIs). Condoms act as a barrier method and can prevent the exchange of bodily fluids that can transmit STIs. They are highly effective in reducing the risk of contracting STIs, including HIV, gonorrhea, chlamydia, and syphilis. Other options mentioned in the question, such as getting pregnant, avoiding breastfeeding, and family planning, do not directly address the prevention of STIs.

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10.
1. The part of the ear which enables hearing is the ?
- A. Ear ossicles
- A. Ear ossicles
- C. Oval window
- D. Cochlea
Correct Answer

A. D. Cochlea

Explanation

The cochlea is the part of the ear that enables hearing. It is a spiral-shaped, fluid-filled structure that contains tiny hair cells. When sound waves enter the ear, they cause the fluid in the cochlea to vibrate. These vibrations are then detected by the hair cells, which convert them into electrical signals that can be interpreted by the brain as sound. The cochlea plays a crucial role in the process of hearing and is responsible for our ability to perceive different pitches and tones.

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1
11.

Which of these is a food chain in the pond ?.
- A. Seed n' mouse' n snake
- B. Grass n' Grasshopper n' toad n' snake
- C. Water lettuce n' tad pole n' Fish
- D. Cactus n' woodrat n' wasp n' hedgeho
Correct Answer

A. C. Water lettuce n' tad pole n' Fish

Explanation

The correct answer is C. Water lettuce n' tadpole n' fish. This is a food chain in the pond because water lettuce is a producer that provides food for tadpoles, which are primary consumers. The tadpoles, in turn, serve as food for fish, which are secondary consumers. This sequence represents the transfer of energy and nutrients from one organism to another in a pond ecosystem.

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2
12.

The following characteristics are of fresh water habitat except.
- (a) low salt content
- (b) high salinity
- (c) shallow water
- (d) low density
- (d) low density
Correct Answer

A. (b) high salinity

Explanation

Freshwater habitats are characterized by low salt content, shallow water, and low density. High salinity, on the other hand, is a characteristic of saltwater habitats such as oceans and seas. Therefore, the correct answer is (b) high salinity.

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13.
1. The character that expresses itself in the presence of the contrasting character is?
- A. Hybrid
- B. Allele
- C. Recessive
- D. Dominant.
Correct Answer

A. D. Dominant.

Explanation

The correct answer is D. Dominant. In genetics, the term "dominant" refers to a trait or allele that is expressed or observed in an individual's phenotype, even if they only have one copy of the gene. In this context, the question is asking about a character that becomes apparent or visible when it is present alongside a contrasting character. This suggests that the character being referred to is dominant, as it is able to mask or override the expression of the contrasting character.

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1
14.
1. Which of the following is not a fresh water habitat. C. Swamp
- A. Pond
- B. Puddle
- C. Swamp
- D. Lake.
Correct Answer

A. B. Puddle

Explanation

A puddle is not considered a freshwater habitat because it is a small, temporary body of water that forms after rainfall or melting snow. Puddles are typically shallow and have a limited amount of water, which quickly evaporates or gets absorbed into the ground. They do not provide a stable environment for freshwater organisms to live and thrive. In contrast, ponds, swamps, and lakes are larger bodies of water that can support a variety of plant and animal species.

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15.
1. Which of the following is not correct about blood platelets, they:
- A. are also known as thrombocytes
- B. have no nucleus
- C. are formed in the red bone marrow
- D. neutralize the toxins in the blood.
Correct Answer

A. D. neutralize the toxins in the blood.

Explanation

Blood platelets, also known as thrombocytes, are small cell fragments that play a crucial role in blood clotting. They do not have a nucleus, making them unique among blood cells. Platelets are formed in the red bone marrow along with other blood cells. However, their main function is to aid in clotting and prevent excessive bleeding, rather than neutralizing toxins in the blood.

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16.
1. Which of the following does not happen during inspiration.
- A. Intercostal muscle contract
- B. Ribs move forward
- C. Thoracic cavity increases
- D. Diaphragm Relaxes
Correct Answer

A. D. Diaphragm Relaxes

Explanation

During inspiration, the diaphragm contracts and moves downward, causing the thoracic cavity to increase in size. This allows for the entry of air into the lungs. Therefore, the statement "D. Diaphragm Relaxes" is incorrect because the diaphragm actually contracts during inspiration.

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17.
1. The function of red blood cells is to ?
- A. Engulf invading bacteria
- B. Aid in protein formation
- C. Transport oxygen to the cells
- D. Central blood glucose levels.
Correct Answer

A. C. Transport oxygen to the cells

Explanation

Red blood cells contain a protein called hemoglobin, which binds to oxygen in the lungs and carries it to the body's cells. This process is crucial for the delivery of oxygen to tissues and organs throughout the body. Red blood cells do not engulf bacteria or aid in protein formation. They also do not regulate blood glucose levels. Therefore, the correct answer is C. Transport oxygen to the cells.

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18.
1. Alga bloom depletes oxygen content of bodies of water polluted by
- A. raw sewage disposal
- B. industrial effluent
- C. crude oil spillage
- D. thermal plant discharge.
Correct Answer

A. A. raw sewage disposal

Explanation

Raw sewage disposal can lead to the growth of algal blooms in bodies of water. When raw sewage is released into water bodies, it introduces excess nutrients such as nitrogen and phosphorus. These nutrients act as fertilizers for algae, causing them to multiply rapidly. As the algae population increases, they consume large amounts of oxygen during photosynthesis. This depletes the oxygen content of the water, leading to hypoxic or anoxic conditions. This can be harmful to aquatic organisms that rely on oxygen, leading to fish kills and other negative impacts on the ecosystem.

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1
19.
1. Muscles are attached to bones by means of
- A. Tendons
- B. Ligament
- C. Cartilage
- D. Nerves.
Correct Answer

A. A. Tendons

Explanation

Muscles are attached to bones by means of tendons. Tendons are tough, fibrous connective tissues that connect muscles to bones. They are responsible for transmitting the force generated by the muscles to the bones, allowing movement and providing stability to the skeletal system. Ligaments, on the other hand, connect bones to other bones, cartilage is a flexible connective tissue found in various parts of the body, and nerves are responsible for transmitting signals between the brain and different parts of the body.

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1
20.
1. Which of the following will ease the friction between the end of bones in a moveable joint
- A. Serum
- B. Tissue
- C. Blood plasma
- D. Synovial fluid.
Correct Answer

A. D. Synovial fluid.

Explanation

Synovial fluid is a thick, slippery fluid that lubricates the joints and reduces friction between the ends of bones in a movable joint. It also provides nutrients to the cartilage and helps in shock absorption. Serum, tissue, and blood plasma do not have the same lubricating properties as synovial fluid, making them less effective in easing friction between the bones.

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21.
1. All the available places on earth which support life constitute the,
- A. Lithosphere
- B. Atmosphere
- C. Biosphere
- D. Hydrosphere.
Correct Answer

A. C. Biosphere

Explanation

The biosphere refers to all the places on Earth where life exists. It includes not only the surface of the Earth, but also the atmosphere and the oceans. The lithosphere refers to the solid outer layer of the Earth, the atmosphere refers to the layer of gases surrounding the Earth, and the hydrosphere refers to all the water on Earth. While these components are important for supporting life, they do not encompass all the places where life exists. Therefore, the correct answer is C. Biosphere.

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22.
1. Which of the following statements about Nitrogen is not correct? Nitrogen is needed for,
- A. Activating certain enzymes
- B. Protein synthesis
- C. The synthesis of chlorophyll
- D. Healthy vegetative growth of plants.
Correct Answer

A. C. The synthesis of chlorophyll

Explanation

Nitrogen is not involved in the synthesis of chlorophyll. Chlorophyll is a green pigment found in plants and is responsible for photosynthesis, which is the process by which plants convert sunlight into energy. Nitrogen, on the other hand, is primarily needed for protein synthesis, activating certain enzymes, and promoting healthy vegetative growth in plants.

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23.

The major reason why foods should be properly covered is that, . .
- A. All water easily evaporates from uncovered food
- B. Hot foods cool off easily when properly covered
- C. Microorganisms in air would contaminate the food if left uncovered
- D. The taste of the food is maintained when covered
Correct Answer

A. C. Microorganisms in air would contaminate the food if left uncovered

Explanation

Properly covering food helps to prevent the contamination of microorganisms from the air. When food is left uncovered, it is exposed to the surrounding environment, including the air which carries various microorganisms. These microorganisms can contaminate the food and lead to spoilage or foodborne illnesses. Therefore, covering food helps to maintain its safety and quality by preventing the entry of harmful microorganisms.

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24.

Microorganisms which break down dead organisms and absorb their content are called?
- A. Decomposer
- B. Consumers
- C. Parasites
- D. Commensals.
Correct Answer

A. B. Consumers

Explanation

Microorganisms that break down dead organisms and absorb their content are called decomposers. Consumers, on the other hand, are organisms that consume other organisms for energy and nutrients. Therefore, the correct answer should be A. Decomposer, not B. Consumers.

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1
25.

Which of the following associations can upset the balance of nature? ..
- A. Epiphytism
- B. Parasitism
- C. Symbiosis
- D. Saprophytism
Correct Answer

A. B. Parasitism

Explanation

Parasitism is a type of association where one organism benefits at the expense of another organism. In this relationship, the parasite feeds on or lives in the host organism, causing harm or even death. This disruption in the balance of nature occurs because parasites rely on the host for survival, often causing a decrease in the host population. As a result, the predator-prey relationships and overall ecosystem dynamics can be significantly altered, potentially leading to a destabilization of the balance of nature.

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26.
1. Which of these is a vector of malaria fever?
- A. Female anopheles mosquito
- B. Male anopheles mosquito
- C. Female culex mosquito
- D. Male culex mosquito.
Correct Answer

A. A. Female anopheles mosquito

Explanation

The female anopheles mosquito is a vector of malaria fever because it is the only mosquito species mentioned that can transmit the malaria parasite to humans. Male mosquitoes do not transmit diseases, and the culex mosquito species mentioned is not known to be a vector for malaria. Therefore, the correct answer is A. Female anopheles mosquito.

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27.

In medicine, bacteria have proved very useful due to the production of,
- A. Nitrate
- B. Antibiotics
- C. Cured tobacco
- D. Tanned leather.
Correct Answer

A. B. Antibiotics

Explanation

Bacteria have proved very useful in medicine due to their ability to produce antibiotics. Antibiotics are substances that can kill or inhibit the growth of bacteria, making them essential in the treatment of bacterial infections. They work by targeting specific components or processes in bacterial cells, preventing their growth and replication. Antibiotics have revolutionized the field of medicine, allowing for the successful treatment of various bacterial diseases and saving countless lives.

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28.
Which one do you like?
1. One of these statements is not correct about the tsetsefly and mosquito, they,
- A. Harbor protozoa as disease agent
- B. Possess piercing and sucking mouth parts
- C. Inject disease causing organisms into the hosts
- D. Have intermediate hosts
Correct Answer

A. D. Have intermediate hosts

Explanation

The correct answer is D. Have intermediate hosts. Tsetse flies and mosquitoes do not have intermediate hosts. They directly transmit diseases to their hosts through their piercing and sucking mouthparts by injecting disease-causing organisms. They can harbor protozoa as disease agents and inject these organisms into the hosts, but they do not require intermediate hosts for disease transmission.

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29.
1. Of the following options, one is the excretory product of Amoeba,
- A. Urea
- B. Ammonia
- C Uric acid
- D. Amino acid.
Correct Answer

A. B. Ammonia

Explanation

Ammonia is the correct answer because Amoeba excretes waste in the form of ammonia. Ammonia is a toxic compound that is produced as a result of protein metabolism in the organism. Amoeba does not have specialized excretory organs like kidneys, so it releases ammonia directly into its environment. Ammonia is a water-soluble compound that can easily diffuse out of the cell and into the surrounding water. This allows Amoeba to get rid of waste efficiently.

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30.

A chemo- autotroph is one of the following organisms,
- A. Virus
- B. Bacteria
- C. Paramecium
- D. Euglena.
Correct Answer

A. B. Bacteria

Explanation

A chemo-autotroph is an organism that can produce its own food using energy obtained from chemical reactions. Bacteria are known to be chemo-autotrophs as they can convert inorganic substances into organic compounds through chemical reactions. Viruses are not considered living organisms as they cannot carry out metabolic processes on their own. Paramecium and Euglena are both eukaryotic organisms, but they are not chemo-autotrophs as they obtain their energy from other sources such as consuming organic matter or photosynthesis. Therefore, the correct answer is B. Bacteria.

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31.

Which among the following are produced by micro organisms .
- A. Fermented dairy products
- B. Breads
- C. Alcoholic beverages
- D. Fermented dairy products, bread and alcoholic beverages.
Correct Answer

A. D. Fermented dairy products, bread and alcoholic beverages.

Explanation

Microorganisms play a crucial role in the production of fermented dairy products, bread, and alcoholic beverages. In the case of fermented dairy products, microorganisms such as bacteria and yeast are used to convert lactose into lactic acid, resulting in the formation of products like yogurt and cheese. Similarly, in the production of bread, yeast is responsible for the fermentation process, which produces carbon dioxide gas and causes the dough to rise. Finally, alcoholic beverages like beer and wine are produced through the fermentation of sugars by yeast, resulting in the formation of alcohol. Therefore, option D correctly identifies the products produced by microorganisms.

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1
32.

The products of respiration are?
- A. Nitrogen and water
- B. Nitrogen and carbon-dioxide
- C. Water and oxygen
- D. Carbon-dioxide and water.
Correct Answer

A. D. Carbon-dioxide and water.

Explanation

The products of respiration are carbon dioxide and water. During cellular respiration, glucose is broken down in the presence of oxygen to produce energy, carbon dioxide, and water. Carbon dioxide is a waste product that is released from the body through exhalation, while water is either excreted as urine or used by the body for various functions. Therefore, option D is the correct answer.

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33.

A chain of events in which one community is gradually replaced by another in an orderly series is?
- A. Population
- B. Ecosystem succession
- C. Succession
- D. Meta population
Correct Answer

A. D. Meta population

Explanation

The correct answer is D. Meta population. A meta population refers to a group of spatially separated populations of the same species that interact with each other. In this scenario, the gradual replacement of one community by another in an orderly series suggests a pattern of movement and colonization by different populations. This aligns with the concept of a meta population, where populations disperse and establish in different areas over time.

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2
34.

Viruses that infection bacteria are called?
- A. Methanogens
- B. Pathogens
- C. Lichens
- D. Bacteriophages
Correct Answer

A. D. Bacteriophages

Explanation

Bacteriophages are viruses that specifically infect bacteria. They attach to the surface of bacterial cells and inject their genetic material into them, taking over the bacterial machinery to produce more phages. This eventually leads to the lysis, or bursting, of the bacterial cell and the release of new phages. Bacteriophages are important in controlling bacterial populations and have been extensively studied for their potential use in phage therapy to treat bacterial infections.

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35.

A pandemic is an outbreak of diseases that?
- A. Is confined to a town
- B. Is wide spread
- C. Will not spread
- D. Has limited spread
Correct Answer

A. B. Is wide spread

Explanation

A pandemic is an outbreak of diseases that is wide spread. This means that it affects a large geographic area, such as multiple countries or continents, and affects a significant number of people. Unlike an outbreak or epidemic, which may be more localized, a pandemic has a global impact and can result in widespread illness and death.

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36.

What is the definition of a pathogens?
- A. Disease- causing organism
- B. Disease-u causing plants
- C. Disease- causing animals
- D. Disease- causing micro-organisms.
Correct Answer

A. D. Disease- causing micro-organisms.

Explanation

Pathogens are defined as disease-causing microorganisms. These microorganisms can include bacteria, viruses, fungi, and parasites. They have the ability to invade and multiply within the host organism, leading to the development of various diseases. Pathogens can be transmitted through direct contact, airborne droplets, contaminated food or water, or vectors such as mosquitoes or ticks. Understanding pathogens and their mechanisms of infection is crucial in preventing and treating infectious diseases.

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1
37.

Which of the following ecological factors is limited to aquatic habitat?
- A. Temperature
- B. Turbidity
- C. Wind
- D. Hydrogen ion concentration.
Correct Answer

A. B. Turbidity

Explanation

Turbidity refers to the measure of the cloudiness or haziness of a fluid caused by suspended particles. It is a characteristic that is specific to aquatic habitats as it is influenced by factors such as sediment, algae, and other particles that are present in water bodies. Temperature, wind, and hydrogen ion concentration are ecological factors that can be found in both aquatic and terrestrial habitats.

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1
38.

Population characteristics include the following except?
- A. Population resizing
- B. Population frequency
- C. Population density
- C. Population distribution
Correct Answer

A. A. Population resizing

Explanation

Population characteristics refer to the various attributes or features of a population. These characteristics help in understanding the composition, distribution, and dynamics of a population. Population resizing, however, does not fall under the category of population characteristics. Instead, it refers to the process of changing the size of a population through various factors such as birth rates, death rates, immigration, and emigration. Therefore, population resizing is not considered as a population characteristic.

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1
39.

. The heredity material in a living cell is located inside the?
- A. Lysosome
- B. Cytoplasm
- C. Protein wall
- D. Nucle
Correct Answer

A. B. Cytoplasm

Explanation

The heredity material in a living cell is located inside the cytoplasm. The cytoplasm is a gel-like substance that fills the cell and contains various organelles, including the nucleus. The nucleus is where the heredity material, DNA, is stored. Therefore, the correct answer is B. Cytoplasm.

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40.

. Removal of waste products through sweat/production of sweat/excretion is function of the?
- A. Mammalian skin
- B. Kidney.
- C. Liver
- D. Lungs
Correct Answer

A. A. Mammalian skin

Explanation

The correct answer is A. Mammalian skin. The skin plays a vital role in removing waste products from the body through sweat. Sweat is produced by sweat glands in the skin and contains waste products such as urea and salts. When we sweat, these waste products are excreted from the body, helping to maintain proper balance and eliminate toxins. The kidneys primarily filter waste from the blood, the liver detoxifies chemicals and metabolizes drugs, and the lungs are responsible for gas exchange. However, in this case, the function of removing waste products through sweat is specifically attributed to the mammalian skin.

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1
41.

. Which of the following instruments can be used for determining the turbidity of water bodies.
- A. Barometer
- B. Anemometer
- C. Colorimeter
- Option 4
Correct Answer

A. C. Colorimeter

Explanation

A colorimeter is an instrument that measures the absorbance or transmittance of light by a solution. In the context of determining the turbidity of water bodies, a colorimeter can be used to measure the amount of suspended particles or solids in the water. Turbidity refers to the cloudiness or haziness of water caused by these suspended particles. By measuring the absorbance or transmittance of light through the water sample, a colorimeter can provide a quantitative measurement of turbidity, helping to assess the water quality.

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1
42.

Animal nutrition involves the study of __________.
- A. animal husbandry
- B. farm equipment and farm produce
- C. food substances and digestive enzymes
- D. the teeth and chewing and biting patterns
Correct Answer

A. C. food substances and digestive enzymes

Explanation

Animal nutrition involves the study of food substances and digestive enzymes. This includes understanding the different types of nutrients that animals need in their diet, such as carbohydrates, proteins, fats, vitamins, and minerals. It also involves studying how animals digest and absorb these nutrients, as well as the role of enzymes in breaking down food molecules. Understanding animal nutrition is important for ensuring that animals are provided with a balanced diet that meets their nutritional requirements for growth, reproduction, and overall health.

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43.

The term ecosystem refers to _____.
- A. different groups of green plants in a habitat
- B. the relationship between animals and plants in a given environment
- C. living organisms interacting with the physical environment
- D. members of particular plants and animals living in a habitat
Correct Answer

A. C. living organisms interacting with the physical environment

Explanation

The term ecosystem refers to living organisms interacting with the physical environment. This includes the relationships and interactions between plants, animals, and their surroundings, such as the air, water, soil, and climate. Ecosystems are dynamic and complex systems where energy and nutrients flow through various organisms, and they are essential for maintaining the balance and sustainability of the natural world.

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44.

44. The most effective method of dealing with non-biodegradable pollutants is by _____.
- A. dumping
- B. recycling
- C. incineration
- D. burying
Correct Answer

A. D. burying

Explanation

The most effective method of dealing with non-biodegradable pollutants is by burying them. This method ensures that the pollutants are safely contained and do not pose a threat to the environment or human health. Burying also prevents the pollutants from contaminating water sources or being released into the atmosphere. Recycling and incineration may be effective for certain types of pollutants, but burying is generally considered the best option for long-term containment and prevention of pollution. Dumping, on the other hand, is not a responsible or effective method as it simply involves disposing of the pollutants without any containment or proper management.

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3
45.

Which of the following is not a factor responsible for population sizes?
- A. Nativity
- B. Feeding
- C. Immigration
- D. Mortality
Correct Answer

A. B. Feeding

Explanation

Feeding is not a factor responsible for population sizes because while it may affect individual survival and reproductive success, it does not directly impact the overall size of a population. Factors such as nativity (birth rate), immigration (movement of individuals into a population), and mortality (death rate) have a more direct influence on population sizes as they affect the number of individuals entering, leaving, and being born or dying within a population.

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3
46.

Which of these organisms is both holozoic and autotrophic? .
- A. Spirogyra
- B. Paramecium
- C. Euglena
- D. Amoeba
Correct Answer

A. C. Euglena

Explanation

Euglena is both holozoic and autotrophic. Holozoic organisms obtain their nutrition by ingesting solid food particles, while autotrophic organisms are able to produce their own food through photosynthesis. Euglena possesses chloroplasts, which allow it to carry out photosynthesis and produce its own food. Additionally, Euglena can also feed on other small organisms through phagocytosis, making it holozoic. Therefore, Euglena fits the criteria of being both holozoic and autotrophic.

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2
47.

Possession of strong adhesives is a feature of animals living in ________.
- A. sandy beaches
- B. rocky chores
- C. benthic zones
- D. deserts
Correct Answer

A. C. benthic zones

Explanation

Animals living in benthic zones, which are the bottom regions of aquatic environments, often need to cling onto surfaces to avoid being swept away by currents. Possession of strong adhesives would be beneficial for these animals to attach themselves to rocks or other surfaces in order to stay in place. Therefore, possession of strong adhesives is a feature of animals living in benthic zones.

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48.

Water loss is most rapid in _____ soil.
- A. sandy
- B. clayey
- C. sandy-loam
- D. loamy
Correct Answer

A. A. sandy

Explanation

Water loss is most rapid in sandy soil because sandy soil has larger particles with bigger gaps between them. These larger gaps allow water to easily drain through the soil, resulting in rapid water loss. In contrast, clayey soil has smaller particles with smaller gaps, which slows down the movement of water and reduces water loss. Sandy-loam and loamy soils have a mixture of sand, silt, and clay particles, which can retain water better than sandy soil and therefore have slower water loss.

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49.

An acidic soil can be improved upon by ______________.
- A. sedimentation
- B. leaching
- C. flocculation
- Watering
- Option 5
Correct Answer

A. C. flocculation

Explanation

Flocculation is the process of clumping together fine particles in a solution to form larger particles, which can then settle out more easily. In the case of acidic soil, flocculation can help improve it by binding together the small particles and increasing the soil's ability to retain water and nutrients. This can help neutralize the acidity and create a more balanced and fertile soil environment for plants to thrive.

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